Ceiling-mold.



' --'My inventions relates to .UNITED STATES PATENT OEEICE.l JACOB B. BLAw, OE'PITTSBUBG, PENNSYLVANIA, ASSJGNOB .To BLAw vCOLLAPSIBLE STEEL CE-NTEBING COMPANY, OE- PITTSBUBG, PENN- SYLVANIA, A CORPORATION 'OE NEW' JERSEY.

CEILING-MOLD.

Speccaton'of Letters Patent.

Patented May 21 i907.

Application nea November 12,190a` sain No. 343,010.

j crete ceilings, and'has forits objects; to prcduce a mold which can be readily released from the concrete; toproduce a mold whichdrawing in which the `figure isK a transverse section through the mold and-the concrete.

My mold is preferably 'constructed of thin sheetmetal which can be easily handled, an dl furthermorecan be detached from the concrete after it has set', by a gradual or peeling can be used only a few times. v the otherhand, produces' a v'smooth surface, can be detached easily`i's cheap and practicallyindestructible. i

action, and .without hammering or jarring which hasla tendency to crack the concrete.

Heretofore wooden molds have been used for the concrete, but such'molds fail'to produce 'a smooth surface, are. detached with difficulty', arelcumbersome and ex ensive, and

Referring tothe`drawing, 2 and 3 are arched plates of thin flexibleV sheet'metalof: any desired length convenient for handling, 4 are butt straps for joining the arched plates together, which butt straps are riveted --to the plates 2 'and 3 and secured to the opposing plates by means ofthe loops 5 fastened tc the plates -1 and 2 and extending through slots in the buttplates, 4in `which they areiheldby means of short we ges in' a manner well known in the art. The various plates aref-stifenedbymeans of the transverse turnbuckles 6, which turnbuckles are' secured'tov the plates by means of the angles 7, which angles are provided'with holes for ,they reception` of the bent ends ofthe turnbuckles. The turnbuckles not only serve to stiffenthe arched members, but also serve to molds l for I ,con-

w ymold on.

ositionv it is es'ired to remove the molds to' anew-position, -In operation the' mold member may be supported adjacent the butt straps 4 either bymeans of temporary pillars lor posts from the Hoor beneath, or by'means of members .extending downl from the '.Ifbeams S lwhich constitute the frame-work of the ceiling. 'After the concrete lhas set,l the supports adjacent the butt straps are removed,

andthe arches are collapsed one at a n Wil-1 be geen from the fore'ging thi-tty using a plurality, of arched' plates, a mold .of

with the colla se them after the concrete has set and l the" holding Wedges drawn from the loops 5 ample stiffness can be'made outof material' ySo thin that if flat it would `sag l slightest Weight, fand further, because of the small size of the" arches eachmay be collapsed with slight difficulty. v`It will also be. noted that the' arches add .to theornamental appearance ofthe ceiling.

desire to secure by LettersPatent, is the'following: l

lL-Incombination, a ceiling mold, com- Y posedof iiexible material and comprising a.

plurality of arched lates detachably secured y together at their e ges and having stiflening fand collapsing braces.

2,-In combination, al ceiling mold com? posed of `flexible;materialf'and comprising a:

plurality .of arched platesdetachably secured tgether at their edges'and having transverse stiffeningandcollapsing braces engaging the plates near their edges. f

3. In combination with* a ceiling mold composed of. flexible material and .comprising a plurality of arched plates having their `adjacent edges out turned, "of fastening" means for holding' the out turned edges-in alinement, and StiHening iand collapsing braces for the arches. In testimony whereof l I have hereunto signed my 'nameiii the presence of' the two subscribed witnesses.

' JACOB B,.,BLAw.

Witness:

J. C. BRADLEY, Anduwon'rir MARTIN. 

